Charles Ellicott Commentary Micah 6:15

"Thou shalt sow, but shalt not reap; thou shalt tread the olives, but shalt not anoint thee with oil; and the vintage, but shalt not drink the wine." — Micah 6:15 (ASV)

You shall tread the olives — that is, as wheat upon the threshing-floor. Oil was regarded as indispensable for personal comfort. In Jotham’s parable of the trees in council about the choice of a king, the olive-tree was regarded first in estimation, before even the vine and fig-tree.